I am a Toronto born and raised Canadian. This is how eh is often used here:
Typically used to replace terms such as:
"Did you know?"
Guy 1): "McDonalds replaced the double cheese burger with the McDouble on the value menu eh?"
Guy 2): "Really? Damn... those McBastards"
Often used to replace the word 'right?'
Guy 1) "You're going to school tomorrow, eh?"
Guy 2) "Yeah, I try not to miss class"
Also replaces 'right' in the following sentence:
ImATwin ): Taylor Lautner is so hot!
sLaShK ) : I know, eh!
"You know what I mean?"
Guy 1): "Im going to walmart to buy toilet paper"
Guy 2): "Get the thick stuff eh? Don't be cheap"
Guy 1): "Yes of course, no one likes that thin equate stuff"
"What do you think"
Girl 1): I bought a new pair of TOMS. Cool eh?
Guy2): Yeah, they're pretty cool. I might buy a pair as well.
"Don't you think?"
Often used to ask for a response of agreement or disagreement, similar in meaning to "don't you think?"
Guy1): Look at those dark clouds. It looks like there might be a storm coming eh?
Guy2): Yeah definitely, I'm gonna bring an umbrella
"What was that?" or "what?"
Guy1): *inaudibley speaking, then guy 2 catches the end of the sentence "And thats why your so dumb"
Scenario: Two guys watching the Leafs!
Guy 1): I'm gonna order pizza pizza
Guy 2): ..... *no response
Guy 1): I'm ordering pizza EH
Guy 2): Wha? Yeah ok... shhh the game is on
2.Put at the end of a sentence to add more verbal contact between two people
3.Used to change a statement into a question. Usually at the end of the sentence.
2."How are you today eh."
3."That was some cool stuff, eh?"